Summary: letters to nature
NATURE |VOL 404 |27 APRIL 2000 |www.nature.com 1007
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Supplementary information is available from Nature's World-Wide Web site (http://
www.nature.com) or as paper copy from the London editorial of®ce of Nature.
We thank S. R. Lee and S. G. Rhee for sharing their expertise in HPLC analysis. We thank
T. Chan, M. Esteller, N. Watkins and other members of our laboratories for helpful
discussions. This work was supported by the Clayton Fund and by the National Institutes
of Health. K.E.S. is a Fellow of the American Cancer Society.
Correspondence and requests for materials should be addressed to K.E.S.